工具代码
package toolimport ("bytes""crypto/aes""crypto/cipher"
)
var key []byte = []byte("0@#3456789ABCDEF")
func Encrypt(data []byte) ([]byte, error) {block, err := aes.NewCipher(key)if err != nil {return nil, err}paddingLen := aes.BlockSize - (len(data) % aes.BlockSize)paddedData := append(data, bytes.Repeat([]byte{byte(paddingLen)}, paddingLen)...)encrypted := make([]byte, len(paddedData))iv := make([]byte, aes.BlockSize) mode := cipher.NewCBCEncrypter(block, iv)mode.CryptBlocks(encrypted, paddedData)return encrypted, nil
}
func Decrypt(encryptedData []byte) ([]byte, error) {block, err := aes.NewCipher(key)if err != nil {return nil, err}decrypted := make([]byte, len(encryptedData))iv := make([]byte, aes.BlockSize) mode := cipher.NewCBCDecrypter(block, iv)mode.CryptBlocks(decrypted, encryptedData)paddingLen := int(decrypted[len(decrypted)-1])decrypted = decrypted[:len(decrypted)-paddingLen]return decrypted, nil
}
func CalculateEncryptedLength(dataLen int) int {paddingLen := aes.BlockSize - (dataLen % aes.BlockSize)encryptedLen := dataLen + paddingLenreturn encryptedLen
}
测试类
package test
import ("beego_test/tool""testing"
)
func Test_encryption(t *testing.T) {originalBytes := []byte{115, 91, 212, 128, 220, 50, 0, 247, 207, 91, 178, 183, 207, 59, 115, 91}encryptedBytes, err := tool.Encrypt(originalBytes)if err != nil {log.Fatal(err)}d, err := tool.Decrypt(encryptedBytes)fmt.Println("原始的字节为", originalBytes)fmt.Println("加密后的字节为", encryptedBytes)fmt.Println("加密后的字节的长度为", len(encryptedBytes))fmt.Println("字节49加密后的长度", tool.CalculateEncryptedLength(49))fmt.Println("解密后的字节为", d)fmt.Println("无法根据密文长度推出原文长度")fmt.Println("可以根据密文退出原文")fmt.Println("可以根据原文长度推出密文长度")fmt.Println("如果字节无法解密会报错")tool.Decrypt(originalBytes)
}